linux-toradex.git/net/hsr/hsr_main.c, branch v6.9 Linux kernel for Apalis and Colibri modules hsr: Handle failures in module init 2024-03-19T12:38:17+00:00 Felix Maurer fmaurer@redhat.com 2024-03-15T12:04:52+00:00 3cf28cd492308e5f63ed00b29ea03ca016264376 A failure during registration of the netdev notifier was not handled at all. A failure during netlink initialization did not unregister the netdev notifier. Handle failures of netdev notifier registration and netlink initialization. Both functions should only return negative values on failure and thereby lead to the hsr module not being loaded. Fixes: f421436a591d ("net/hsr: Add support for the High-availability Seamless Redundancy protocol (HSRv0)") Signed-off-by: Felix Maurer <fmaurer@redhat.com> Reviewed-by: Shigeru Yoshida <syoshida@redhat.com> Reviewed-by: Breno Leitao <leitao@debian.org> Link: https://lore.kernel.org/r/3ce097c15e3f7ace98fc7fd9bcbf299f092e63d1.1710504184.git.fmaurer@redhat.com Signed-off-by: Paolo Abeni <pabeni@redhat.com> 
A failure during registration of the netdev notifier was not handled at
all. A failure during netlink initialization did not unregister the netdev
notifier.

Handle failures of netdev notifier registration and netlink initialization.
Both functions should only return negative values on failure and thereby
lead to the hsr module not being loaded.

Fixes: f421436a591d ("net/hsr: Add support for the High-availability Seamless Redundancy protocol (HSRv0)")
Signed-off-by: Felix Maurer <fmaurer@redhat.com>
Reviewed-by: Shigeru Yoshida <syoshida@redhat.com>
Reviewed-by: Breno Leitao <leitao@debian.org>
Link: https://lore.kernel.org/r/3ce097c15e3f7ace98fc7fd9bcbf299f092e63d1.1710504184.git.fmaurer@redhat.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
net: fill in MODULE_DESCRIPTION()s for HSR 2024-01-12T00:16:08+00:00 Breno Leitao leitao@debian.org 2024-01-08T18:16:03+00:00 417d8c571cb49fcace83a6b6477da2970802bf26 W=1 builds now warn if module is built without a MODULE_DESCRIPTION(). Add descriptions to High-availability Seamless Redundancy (HSR) driver. Signed-off-by: Breno Leitao <leitao@debian.org> Link: https://lore.kernel.org/r/20240108181610.2697017-4-leitao@debian.org Signed-off-by: Jakub Kicinski <kuba@kernel.org> 
W=1 builds now warn if module is built without a MODULE_DESCRIPTION().
Add descriptions to High-availability Seamless Redundancy (HSR) driver.

Signed-off-by: Breno Leitao <leitao@debian.org>
Link: https://lore.kernel.org/r/20240108181610.2697017-4-leitao@debian.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
net: use eth_hw_addr_set() instead of ether_addr_copy() 2021-10-02T13:18:25+00:00 Jakub Kicinski kuba@kernel.org 2021-10-01T21:32:22+00:00 e35b8d7dbb094c79daf920797c372911edc2d525 Convert from ether_addr_copy() to eth_hw_addr_set(): @@ expression dev, np; @@ - ether_addr_copy(dev->dev_addr, np) + eth_hw_addr_set(dev, np) Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net> 
Convert from ether_addr_copy() to eth_hw_addr_set():

  @@
  expression dev, np;
  @@
  - ether_addr_copy(dev->dev_addr, np)
  + eth_hw_addr_set(dev, np)

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
net: hsr: add offloading support 2021-02-11T21:24:44+00:00 George McCollister george.mccollister@gmail.com 2021-02-10T01:02:11+00:00 dcf0cd1cc58b8e88793ad6531db9b3a47324ca09 Add support for offloading of HSR/PRP (IEC 62439-3) tag insertion tag removal, duplicate generation and forwarding. For HSR, insertion involves the switch adding a 6 byte HSR header after the 14 byte Ethernet header. For PRP it adds a 6 byte trailer. Tag removal involves automatically stripping the HSR/PRP header/trailer in the switch. This is possible when the switch also performs auto deduplication using the HSR/PRP header/trailer (making it no longer required). Forwarding involves automatically forwarding between redundant ports in an HSR. This is crucial because delay is accumulated as a frame passes through each node in the ring. Duplication involves the switch automatically sending a single frame from the CPU port to both redundant ports. This is required because the inserted HSR/PRP header/trailer must contain the same sequence number on the frames sent out both redundant ports. Export is_hsr_master so DSA can tell them apart from other devices in dsa_slave_changeupper. Signed-off-by: George McCollister <george.mccollister@gmail.com> Reviewed-by: Vladimir Oltean <olteanv@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> 
Add support for offloading of HSR/PRP (IEC 62439-3) tag insertion
tag removal, duplicate generation and forwarding.

For HSR, insertion involves the switch adding a 6 byte HSR header after
the 14 byte Ethernet header. For PRP it adds a 6 byte trailer.

Tag removal involves automatically stripping the HSR/PRP header/trailer
in the switch. This is possible when the switch also performs auto
deduplication using the HSR/PRP header/trailer (making it no longer
required).

Forwarding involves automatically forwarding between redundant ports in
an HSR. This is crucial because delay is accumulated as a frame passes
through each node in the ring.

Duplication involves the switch automatically sending a single frame
from the CPU port to both redundant ports. This is required because the
inserted HSR/PRP header/trailer must contain the same sequence number
on the frames sent out both redundant ports.

Export is_hsr_master so DSA can tell them apart from other devices in
dsa_slave_changeupper.

Signed-off-by: George McCollister <george.mccollister@gmail.com>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
hsr: enhance netlink socket interface to support PRP 2020-07-27T19:20:40+00:00 Murali Karicheri m-karicheri2@ti.com 2020-07-22T14:40:16+00:00 8f4c0e01789c18674acdf17cae3822b3dc3db715 Parallel Redundancy Protocol (PRP) is another redundancy protocol introduced by IEC 63439 standard. It is similar to HSR in many aspects:- - Use a pair of Ethernet interfaces to created the PRP device - Use a 6 byte redundancy protocol part (RCT, Redundancy Check Trailer) similar to HSR Tag. - Has Link Redundancy Entity (LRE) that works with RCT to implement redundancy. Key difference is that the protocol unit is a trailer instead of a prefix as in HSR. That makes it inter-operable with tradition network components such as bridges/switches which treat it as pad bytes, whereas HSR nodes requires some kind of translators (Called redbox) to talk to regular network devices. This features allows regular linux box to be converted to a DAN-P box. DAN-P stands for Dual Attached Node - PRP similar to DAN-H (Dual Attached Node - HSR). Add a comment at the header/source code to explicitly state that the driver files also handles PRP protocol as well. Signed-off-by: Murali Karicheri <m-karicheri2@ti.com> Signed-off-by: David S. Miller <davem@davemloft.net> 
Parallel Redundancy Protocol (PRP) is another redundancy protocol
introduced by IEC 63439 standard. It is similar to HSR in many
aspects:-

 - Use a pair of Ethernet interfaces to created the PRP device
 - Use a 6 byte redundancy protocol part (RCT, Redundancy Check
   Trailer) similar to HSR Tag.
 - Has Link Redundancy Entity (LRE) that works with RCT to implement
   redundancy.

Key difference is that the protocol unit is a trailer instead of a
prefix as in HSR. That makes it inter-operable with tradition network
components such as bridges/switches which treat it as pad bytes,
whereas HSR nodes requires some kind of translators (Called redbox) to
talk to regular network devices. This features allows regular linux box
to be converted to a DAN-P box. DAN-P stands for Dual Attached Node - PRP
similar to DAN-H (Dual Attached Node - HSR).

Add a comment at the header/source code to explicitly state that the
driver files also handles PRP protocol as well.

Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
hsr: avoid to create proc file after unregister 2020-06-23T03:42:23+00:00 Taehee Yoo ap420073@gmail.com 2020-06-21T13:46:25+00:00 de0083c7ed7dba036d1ed6e012157649d45313c8 When an interface is being deleted, "/proc/net/dev_snmp6/<interface name>" is deleted. The function for this is addrconf_ifdown() in the addrconf_notify() and it is called by notification, which is NETDEV_UNREGISTER. But, if NETDEV_CHANGEMTU is triggered after NETDEV_UNREGISTER, this proc file will be created again. This recreated proc file will be deleted by netdev_wati_allrefs(). Before netdev_wait_allrefs() is called, creating a new HSR interface routine can be executed and It tries to create a proc file but it will find an un-deleted proc file. At this point, it warns about it. To avoid this situation, it can use ->dellink() instead of ->ndo_uninit() to release resources because ->dellink() is called before NETDEV_UNREGISTER. So, a proc file will not be recreated. Test commands ip link add dummy0 type dummy ip link add dummy1 type dummy ip link set dummy0 mtu 1300 #SHELL1 while : do ip link add hsr0 type hsr slave1 dummy0 slave2 dummy1 done #SHELL2 while : do ip link del hsr0 done Splat looks like: [ 9888.980852][ T2752] proc_dir_entry 'dev_snmp6/hsr0' already registered [ 9888.981797][ C2] WARNING: CPU: 2 PID: 2752 at fs/proc/generic.c:372 proc_register+0x2d5/0x430 [ 9888.981798][ C2] Modules linked in: hsr dummy veth openvswitch nsh nf_conncount nf_nat nf_conntrack nf_defrag_ipv6x [ 9888.981814][ C2] CPU: 2 PID: 2752 Comm: ip Tainted: G W 5.8.0-rc1+ #616 [ 9888.981815][ C2] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006 [ 9888.981816][ C2] RIP: 0010:proc_register+0x2d5/0x430 [ 9888.981818][ C2] Code: fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 65 01 00 00 49 8b b5 e0 00 00 00 48 89 ea 40 [ 9888.981819][ C2] RSP: 0018:ffff8880628dedf0 EFLAGS: 00010286 [ 9888.981821][ C2] RAX: dffffc0000000008 RBX: ffff888028c69170 RCX: ffffffffaae09a62 [ 9888.981822][ C2] RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff88806c9f75ac [ 9888.981823][ C2] RBP: ffff888028c693f4 R08: ffffed100d9401bd R09: ffffed100d9401bd [ 9888.981824][ C2] R10: ffffffffaddf406f R11: 0000000000000001 R12: ffff888028c69308 [ 9888.981825][ C2] R13: ffff8880663584c8 R14: dffffc0000000000 R15: ffffed100518d27e [ 9888.981827][ C2] FS: 00007f3876b3b0c0(0000) GS:ffff88806c800000(0000) knlGS:0000000000000000 [ 9888.981828][ C2] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 9888.981829][ C2] CR2: 00007f387601a8c0 CR3: 000000004101a002 CR4: 00000000000606e0 [ 9888.981830][ C2] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 9888.981831][ C2] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 9888.981832][ C2] Call Trace: [ 9888.981833][ C2] ? snmp6_seq_show+0x180/0x180 [ 9888.981834][ C2] proc_create_single_data+0x7c/0xa0 [ 9888.981835][ C2] snmp6_register_dev+0xb0/0x130 [ 9888.981836][ C2] ipv6_add_dev+0x4b7/0xf60 [ 9888.981837][ C2] addrconf_notify+0x684/0x1ca0 [ 9888.981838][ C2] ? __mutex_unlock_slowpath+0xd0/0x670 [ 9888.981839][ C2] ? kasan_unpoison_shadow+0x30/0x40 [ 9888.981840][ C2] ? wait_for_completion+0x250/0x250 [ 9888.981841][ C2] ? inet6_ifinfo_notify+0x100/0x100 [ 9888.981842][ C2] ? dropmon_net_event+0x227/0x410 [ 9888.981843][ C2] ? notifier_call_chain+0x90/0x160 [ 9888.981844][ C2] ? inet6_ifinfo_notify+0x100/0x100 [ 9888.981845][ C2] notifier_call_chain+0x90/0x160 [ 9888.981846][ C2] register_netdevice+0xbe5/0x1070 [ ... ] Reported-by: syzbot+1d51c8b74efa4c44adeb@syzkaller.appspotmail.com Fixes: e0a4b99773d3 ("hsr: use upper/lower device infrastructure") Signed-off-by: Taehee Yoo <ap420073@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> 
When an interface is being deleted, "/proc/net/dev_snmp6/<interface name>"
is deleted.
The function for this is addrconf_ifdown() in the addrconf_notify() and
it is called by notification, which is NETDEV_UNREGISTER.
But, if NETDEV_CHANGEMTU is triggered after NETDEV_UNREGISTER,
this proc file will be created again.
This recreated proc file will be deleted by netdev_wati_allrefs().
Before netdev_wait_allrefs() is called, creating a new HSR interface
routine can be executed and It tries to create a proc file but it will
find an un-deleted proc file.
At this point, it warns about it.

To avoid this situation, it can use ->dellink() instead of
->ndo_uninit() to release resources because ->dellink() is called
before NETDEV_UNREGISTER.
So, a proc file will not be recreated.

Test commands
    ip link add dummy0 type dummy
    ip link add dummy1 type dummy
    ip link set dummy0 mtu 1300

    #SHELL1
    while :
    do
        ip link add hsr0 type hsr slave1 dummy0 slave2 dummy1
    done

    #SHELL2
    while :
    do
        ip link del hsr0
    done

Splat looks like:
[ 9888.980852][ T2752] proc_dir_entry 'dev_snmp6/hsr0' already registered
[ 9888.981797][    C2] WARNING: CPU: 2 PID: 2752 at fs/proc/generic.c:372 proc_register+0x2d5/0x430
[ 9888.981798][    C2] Modules linked in: hsr dummy veth openvswitch nsh nf_conncount nf_nat nf_conntrack nf_defrag_ipv6x
[ 9888.981814][    C2] CPU: 2 PID: 2752 Comm: ip Tainted: G        W         5.8.0-rc1+ #616
[ 9888.981815][    C2] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
[ 9888.981816][    C2] RIP: 0010:proc_register+0x2d5/0x430
[ 9888.981818][    C2] Code: fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 65 01 00 00 49 8b b5 e0 00 00 00 48 89 ea 40
[ 9888.981819][    C2] RSP: 0018:ffff8880628dedf0 EFLAGS: 00010286
[ 9888.981821][    C2] RAX: dffffc0000000008 RBX: ffff888028c69170 RCX: ffffffffaae09a62
[ 9888.981822][    C2] RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff88806c9f75ac
[ 9888.981823][    C2] RBP: ffff888028c693f4 R08: ffffed100d9401bd R09: ffffed100d9401bd
[ 9888.981824][    C2] R10: ffffffffaddf406f R11: 0000000000000001 R12: ffff888028c69308
[ 9888.981825][    C2] R13: ffff8880663584c8 R14: dffffc0000000000 R15: ffffed100518d27e
[ 9888.981827][    C2] FS:  00007f3876b3b0c0(0000) GS:ffff88806c800000(0000) knlGS:0000000000000000
[ 9888.981828][    C2] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 9888.981829][    C2] CR2: 00007f387601a8c0 CR3: 000000004101a002 CR4: 00000000000606e0
[ 9888.981830][    C2] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 9888.981831][    C2] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 9888.981832][    C2] Call Trace:
[ 9888.981833][    C2]  ? snmp6_seq_show+0x180/0x180
[ 9888.981834][    C2]  proc_create_single_data+0x7c/0xa0
[ 9888.981835][    C2]  snmp6_register_dev+0xb0/0x130
[ 9888.981836][    C2]  ipv6_add_dev+0x4b7/0xf60
[ 9888.981837][    C2]  addrconf_notify+0x684/0x1ca0
[ 9888.981838][    C2]  ? __mutex_unlock_slowpath+0xd0/0x670
[ 9888.981839][    C2]  ? kasan_unpoison_shadow+0x30/0x40
[ 9888.981840][    C2]  ? wait_for_completion+0x250/0x250
[ 9888.981841][    C2]  ? inet6_ifinfo_notify+0x100/0x100
[ 9888.981842][    C2]  ? dropmon_net_event+0x227/0x410
[ 9888.981843][    C2]  ? notifier_call_chain+0x90/0x160
[ 9888.981844][    C2]  ? inet6_ifinfo_notify+0x100/0x100
[ 9888.981845][    C2]  notifier_call_chain+0x90/0x160
[ 9888.981846][    C2]  register_netdevice+0xbe5/0x1070
[ ... ]

Reported-by: syzbot+1d51c8b74efa4c44adeb@syzkaller.appspotmail.com
Fixes: e0a4b99773d3 ("hsr: use upper/lower device infrastructure")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
hsr: remove hsr interface if all slaves are removed 2020-04-30T20:25:18+00:00 Taehee Yoo ap420073@gmail.com 2020-04-30T17:37:02+00:00 34a9c361dd480041d790fff3d6ea58513c8769e8 When all hsr slave interfaces are removed, hsr interface doesn't work. At that moment, it's fine to remove an unused hsr interface automatically for saving resources. That's a common behavior of virtual interfaces. Signed-off-by: Taehee Yoo <ap420073@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> 
When all hsr slave interfaces are removed, hsr interface doesn't work.
At that moment, it's fine to remove an unused hsr interface automatically
for saving resources.
That's a common behavior of virtual interfaces.

Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
hsr: use upper/lower device infrastructure 2020-03-01T05:37:03+00:00 Taehee Yoo ap420073@gmail.com 2020-02-28T18:02:10+00:00 e0a4b99773d3d8d3fb40087805f8fd858a23e582 netdev_upper_dev_link() is useful to manage lower/upper interfaces. And this function internally validates looping, maximum depth. All or most virtual interfaces that could have a real interface (e.g. macsec, macvlan, ipvlan etc.) use lower/upper infrastructure. Signed-off-by: Taehee Yoo <ap420073@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> 
netdev_upper_dev_link() is useful to manage lower/upper interfaces.
And this function internally validates looping, maximum depth.
All or most virtual interfaces that could have a real interface
(e.g. macsec, macvlan, ipvlan etc.) use lower/upper infrastructure.

Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
hsr: fix slab-out-of-bounds Read in hsr_debugfs_rename() 2019-12-31T04:36:27+00:00 Taehee Yoo ap420073@gmail.com 2019-12-28T16:28:09+00:00 04b69426d846cd04ca9acefff1ea39e1c64d2714 hsr slave interfaces don't have debugfs directory. So, hsr_debugfs_rename() shouldn't be called when hsr slave interface name is changed. Test commands: ip link add dummy0 type dummy ip link add dummy1 type dummy ip link add hsr0 type hsr slave1 dummy0 slave2 dummy1 ip link set dummy0 name ap Splat looks like: [21071.899367][T22666] ap: renamed from dummy0 [21071.914005][T22666] ================================================================== [21071.919008][T22666] BUG: KASAN: slab-out-of-bounds in hsr_debugfs_rename+0xaa/0xb0 [hsr] [21071.923640][T22666] Read of size 8 at addr ffff88805febcd98 by task ip/22666 [21071.926941][T22666] [21071.927750][T22666] CPU: 0 PID: 22666 Comm: ip Not tainted 5.5.0-rc2+ #240 [21071.929919][T22666] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006 [21071.935094][T22666] Call Trace: [21071.935867][T22666] dump_stack+0x96/0xdb [21071.936687][T22666] ? hsr_debugfs_rename+0xaa/0xb0 [hsr] [21071.937774][T22666] print_address_description.constprop.5+0x1be/0x360 [21071.939019][T22666] ? hsr_debugfs_rename+0xaa/0xb0 [hsr] [21071.940081][T22666] ? hsr_debugfs_rename+0xaa/0xb0 [hsr] [21071.940949][T22666] __kasan_report+0x12a/0x16f [21071.941758][T22666] ? hsr_debugfs_rename+0xaa/0xb0 [hsr] [21071.942674][T22666] kasan_report+0xe/0x20 [21071.943325][T22666] hsr_debugfs_rename+0xaa/0xb0 [hsr] [21071.944187][T22666] hsr_netdev_notify+0x1fe/0x9b0 [hsr] [21071.945052][T22666] ? __module_text_address+0x13/0x140 [21071.945897][T22666] notifier_call_chain+0x90/0x160 [21071.946743][T22666] dev_change_name+0x419/0x840 [21071.947496][T22666] ? __read_once_size_nocheck.constprop.6+0x10/0x10 [21071.948600][T22666] ? netdev_adjacent_rename_links+0x280/0x280 [21071.949577][T22666] ? __read_once_size_nocheck.constprop.6+0x10/0x10 [21071.950672][T22666] ? lock_downgrade+0x6e0/0x6e0 [21071.951345][T22666] ? do_setlink+0x811/0x2ef0 [21071.951991][T22666] do_setlink+0x811/0x2ef0 [21071.952613][T22666] ? is_bpf_text_address+0x81/0xe0 [ ... ] Reported-by: syzbot+9328206518f08318a5fd@syzkaller.appspotmail.com Fixes: 4c2d5e33dcd3 ("hsr: rename debugfs file when interface name is changed") Signed-off-by: Taehee Yoo <ap420073@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> 
hsr slave interfaces don't have debugfs directory.
So, hsr_debugfs_rename() shouldn't be called when hsr slave interface name
is changed.

Test commands:
    ip link add dummy0 type dummy
    ip link add dummy1 type dummy
    ip link add hsr0 type hsr slave1 dummy0 slave2 dummy1
    ip link set dummy0 name ap

Splat looks like:
[21071.899367][T22666] ap: renamed from dummy0
[21071.914005][T22666] ==================================================================
[21071.919008][T22666] BUG: KASAN: slab-out-of-bounds in hsr_debugfs_rename+0xaa/0xb0 [hsr]
[21071.923640][T22666] Read of size 8 at addr ffff88805febcd98 by task ip/22666
[21071.926941][T22666]
[21071.927750][T22666] CPU: 0 PID: 22666 Comm: ip Not tainted 5.5.0-rc2+ #240
[21071.929919][T22666] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
[21071.935094][T22666] Call Trace:
[21071.935867][T22666]  dump_stack+0x96/0xdb
[21071.936687][T22666]  ? hsr_debugfs_rename+0xaa/0xb0 [hsr]
[21071.937774][T22666]  print_address_description.constprop.5+0x1be/0x360
[21071.939019][T22666]  ? hsr_debugfs_rename+0xaa/0xb0 [hsr]
[21071.940081][T22666]  ? hsr_debugfs_rename+0xaa/0xb0 [hsr]
[21071.940949][T22666]  __kasan_report+0x12a/0x16f
[21071.941758][T22666]  ? hsr_debugfs_rename+0xaa/0xb0 [hsr]
[21071.942674][T22666]  kasan_report+0xe/0x20
[21071.943325][T22666]  hsr_debugfs_rename+0xaa/0xb0 [hsr]
[21071.944187][T22666]  hsr_netdev_notify+0x1fe/0x9b0 [hsr]
[21071.945052][T22666]  ? __module_text_address+0x13/0x140
[21071.945897][T22666]  notifier_call_chain+0x90/0x160
[21071.946743][T22666]  dev_change_name+0x419/0x840
[21071.947496][T22666]  ? __read_once_size_nocheck.constprop.6+0x10/0x10
[21071.948600][T22666]  ? netdev_adjacent_rename_links+0x280/0x280
[21071.949577][T22666]  ? __read_once_size_nocheck.constprop.6+0x10/0x10
[21071.950672][T22666]  ? lock_downgrade+0x6e0/0x6e0
[21071.951345][T22666]  ? do_setlink+0x811/0x2ef0
[21071.951991][T22666]  do_setlink+0x811/0x2ef0
[21071.952613][T22666]  ? is_bpf_text_address+0x81/0xe0
[ ... ]

Reported-by: syzbot+9328206518f08318a5fd@syzkaller.appspotmail.com
Fixes: 4c2d5e33dcd3 ("hsr: rename debugfs file when interface name is changed")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
hsr: fix a race condition in node list insertion and deletion 2019-12-26T00:35:35+00:00 Taehee Yoo ap420073@gmail.com 2019-12-22T11:26:54+00:00 92a35678ec075100ce666a2fb6969151affb0e5d hsr nodes are protected by RCU and there is no write side lock. But node insertions and deletions could be being operated concurrently. So write side locking is needed. Test commands: ip netns add nst ip link add veth0 type veth peer name veth1 ip link add veth2 type veth peer name veth3 ip link set veth1 netns nst ip link set veth3 netns nst ip link set veth0 up ip link set veth2 up ip link add hsr0 type hsr slave1 veth0 slave2 veth2 ip a a 192.168.100.1/24 dev hsr0 ip link set hsr0 up ip netns exec nst ip link set veth1 up ip netns exec nst ip link set veth3 up ip netns exec nst ip link add hsr1 type hsr slave1 veth1 slave2 veth3 ip netns exec nst ip a a 192.168.100.2/24 dev hsr1 ip netns exec nst ip link set hsr1 up for i in {0..9} do for j in {0..9} do for k in {0..9} do for l in {0..9} do arping 192.168.100.2 -I hsr0 -s 00:01:3$i:4$j:5$k:6$l -c1 & done done done done Splat looks like: [ 236.066091][ T3286] list_add corruption. next->prev should be prev (ffff8880a5940300), but was ffff8880a5940d0. [ 236.069617][ T3286] ------------[ cut here ]------------ [ 236.070545][ T3286] kernel BUG at lib/list_debug.c:25! [ 236.071391][ T3286] invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN PTI [ 236.072343][ T3286] CPU: 0 PID: 3286 Comm: arping Tainted: G W 5.5.0-rc1+ #209 [ 236.073463][ T3286] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006 [ 236.074695][ T3286] RIP: 0010:__list_add_valid+0x74/0xd0 [ 236.075499][ T3286] Code: 48 39 da 75 27 48 39 f5 74 36 48 39 dd 74 31 48 83 c4 08 b8 01 00 00 00 5b 5d c3 48 b [ 236.078277][ T3286] RSP: 0018:ffff8880aaa97648 EFLAGS: 00010286 [ 236.086991][ T3286] RAX: 0000000000000075 RBX: ffff8880d4624c20 RCX: 0000000000000000 [ 236.088000][ T3286] RDX: 0000000000000075 RSI: 0000000000000008 RDI: ffffed1015552ebf [ 236.098897][ T3286] RBP: ffff88809b53d200 R08: ffffed101b3c04f9 R09: ffffed101b3c04f9 [ 236.099960][ T3286] R10: 00000000308769a1 R11: ffffed101b3c04f8 R12: ffff8880d4624c28 [ 236.100974][ T3286] R13: ffff8880d4624c20 R14: 0000000040310100 R15: ffff8880ce17ee02 [ 236.138967][ T3286] FS: 00007f23479fa680(0000) GS:ffff8880d9c00000(0000) knlGS:0000000000000000 [ 236.144852][ T3286] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 236.145720][ T3286] CR2: 00007f4a14bab210 CR3: 00000000a61c6001 CR4: 00000000000606f0 [ 236.146776][ T3286] Call Trace: [ 236.147222][ T3286] hsr_add_node+0x314/0x490 [hsr] [ 236.153633][ T3286] hsr_forward_skb+0x2b6/0x1bc0 [hsr] [ 236.154362][ T3286] ? rcu_read_lock_sched_held+0x90/0xc0 [ 236.155091][ T3286] ? rcu_read_lock_bh_held+0xa0/0xa0 [ 236.156607][ T3286] hsr_dev_xmit+0x70/0xd0 [hsr] [ 236.157254][ T3286] dev_hard_start_xmit+0x160/0x740 [ 236.157941][ T3286] __dev_queue_xmit+0x1961/0x2e10 [ 236.158565][ T3286] ? netdev_core_pick_tx+0x2e0/0x2e0 [ ... ] Reported-by: syzbot+3924327f9ad5f4d2b343@syzkaller.appspotmail.com Fixes: f421436a591d ("net/hsr: Add support for the High-availability Seamless Redundancy protocol (HSRv0)") Signed-off-by: Taehee Yoo <ap420073@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> 
hsr nodes are protected by RCU and there is no write side lock.
But node insertions and deletions could be being operated concurrently.
So write side locking is needed.

Test commands:
    ip netns add nst
    ip link add veth0 type veth peer name veth1
    ip link add veth2 type veth peer name veth3
    ip link set veth1 netns nst
    ip link set veth3 netns nst
    ip link set veth0 up
    ip link set veth2 up
    ip link add hsr0 type hsr slave1 veth0 slave2 veth2
    ip a a 192.168.100.1/24 dev hsr0
    ip link set hsr0 up
    ip netns exec nst ip link set veth1 up
    ip netns exec nst ip link set veth3 up
    ip netns exec nst ip link add hsr1 type hsr slave1 veth1 slave2 veth3
    ip netns exec nst ip a a 192.168.100.2/24 dev hsr1
    ip netns exec nst ip link set hsr1 up

    for i in {0..9}
    do
        for j in {0..9}
	do
	    for k in {0..9}
	    do
	        for l in {0..9}
		do
	        arping 192.168.100.2 -I hsr0 -s 00:01:3$i:4$j:5$k:6$l -c1 &
		done
	    done
	done
    done

Splat looks like:
[  236.066091][ T3286] list_add corruption. next->prev should be prev (ffff8880a5940300), but was ffff8880a5940d0.
[  236.069617][ T3286] ------------[ cut here ]------------
[  236.070545][ T3286] kernel BUG at lib/list_debug.c:25!
[  236.071391][ T3286] invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN PTI
[  236.072343][ T3286] CPU: 0 PID: 3286 Comm: arping Tainted: G        W         5.5.0-rc1+ #209
[  236.073463][ T3286] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
[  236.074695][ T3286] RIP: 0010:__list_add_valid+0x74/0xd0
[  236.075499][ T3286] Code: 48 39 da 75 27 48 39 f5 74 36 48 39 dd 74 31 48 83 c4 08 b8 01 00 00 00 5b 5d c3 48 b
[  236.078277][ T3286] RSP: 0018:ffff8880aaa97648 EFLAGS: 00010286
[  236.086991][ T3286] RAX: 0000000000000075 RBX: ffff8880d4624c20 RCX: 0000000000000000
[  236.088000][ T3286] RDX: 0000000000000075 RSI: 0000000000000008 RDI: ffffed1015552ebf
[  236.098897][ T3286] RBP: ffff88809b53d200 R08: ffffed101b3c04f9 R09: ffffed101b3c04f9
[  236.099960][ T3286] R10: 00000000308769a1 R11: ffffed101b3c04f8 R12: ffff8880d4624c28
[  236.100974][ T3286] R13: ffff8880d4624c20 R14: 0000000040310100 R15: ffff8880ce17ee02
[  236.138967][ T3286] FS:  00007f23479fa680(0000) GS:ffff8880d9c00000(0000) knlGS:0000000000000000
[  236.144852][ T3286] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  236.145720][ T3286] CR2: 00007f4a14bab210 CR3: 00000000a61c6001 CR4: 00000000000606f0
[  236.146776][ T3286] Call Trace:
[  236.147222][ T3286]  hsr_add_node+0x314/0x490 [hsr]
[  236.153633][ T3286]  hsr_forward_skb+0x2b6/0x1bc0 [hsr]
[  236.154362][ T3286]  ? rcu_read_lock_sched_held+0x90/0xc0
[  236.155091][ T3286]  ? rcu_read_lock_bh_held+0xa0/0xa0
[  236.156607][ T3286]  hsr_dev_xmit+0x70/0xd0 [hsr]
[  236.157254][ T3286]  dev_hard_start_xmit+0x160/0x740
[  236.157941][ T3286]  __dev_queue_xmit+0x1961/0x2e10
[  236.158565][ T3286]  ? netdev_core_pick_tx+0x2e0/0x2e0
[ ... ]

Reported-by: syzbot+3924327f9ad5f4d2b343@syzkaller.appspotmail.com
Fixes: f421436a591d ("net/hsr: Add support for the High-availability Seamless Redundancy protocol (HSRv0)")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>